EP3163011B1 - Gabarit de puits sous-marin - Google Patents

Gabarit de puits sous-marin Download PDF

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Publication number
EP3163011B1
EP3163011B1 EP16195341.9A EP16195341A EP3163011B1 EP 3163011 B1 EP3163011 B1 EP 3163011B1 EP 16195341 A EP16195341 A EP 16195341A EP 3163011 B1 EP3163011 B1 EP 3163011B1
Authority
EP
European Patent Office
Prior art keywords
template
well
template structure
seabed foundation
seabed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16195341.9A
Other languages
German (de)
English (en)
Other versions
EP3163011A1 (fr
Inventor
Steinar Lindemann HESTETUN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vetco Gray Scandinavia AS
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Vetco Gray Scandinavia AS
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Publication date
Application filed by Vetco Gray Scandinavia AS filed Critical Vetco Gray Scandinavia AS
Publication of EP3163011A1 publication Critical patent/EP3163011A1/fr
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Publication of EP3163011B1 publication Critical patent/EP3163011B1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/02—Surface sealing or packing
    • E21B33/03—Well heads; Setting-up thereof
    • E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/08—Underwater guide bases, e.g. drilling templates; Levelling thereof
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0007—Equipment or details not covered by groups E21B15/00 - E21B40/00 for underwater installations

Definitions

  • the present invention relates to a well template to be located subsea for supporting equipment used in the production of oil and gas from subsea wells.
  • Templates are welded structures designed to provide support and guidance for equipment used in subsea oil and gas production, such as drilling or well completion equipment, wellheads, manifolds and risers, pipeline connection equipment, valve trees etc.
  • a well template is a template designed to group a number of closely positioned subsea wells at a single seabed location.
  • the templates must be designed to withstand loads applied from pipelines or risers or from drilling and maintenance equipment etc. To this purpose the templates need to be installed on the seabed by means of a foundation which must be sufficiently strong to transfer the applied loads into the seabed.
  • a foundation which must be sufficiently strong to transfer the applied loads into the seabed.
  • One typical template foundation includes a set of suction anchors that are lowered into the mud to provide frictional anchorage of the template.
  • a well template must further be designed to withstand loads that are caused by thermal expansion in structural elements which are heated by the produced oil or gas stream, which typically can reach temperatures in the order of 100 °C and above. For this reason some flexibility or expansion capacity needs to be built into the design. For example, thermally induced axial expansion of the well structure and components demands for an ability of relative motion between the template and the components of the well system.
  • GB 2 111 108 is concerned with a diverless subsea template levelling system and method.
  • GB 2 132 669 is concerned with a slip assembly for subsea template.
  • US 2013/240216 is concerned with blow out preventer (BOP) lock down.
  • BOP blow out preventer
  • An object of the present invention is to provide a subsea well template that is able to absorb thermal expansion in subsea wells or well components while still permitting a solid foundation in the seabed as well as a fixed connection between the template and a well system.
  • a subsea well template comprising a template structure that is resting on a seabed foundation, wherein the template structure and seabed foundation are mutually connected through a connection that permits movable engagement between the template structure and the seabed foundation, at least in vertical directions.
  • the seabed foundation can be made stiffer and in this way provide a more solid base for the equipment that is to be installed and supported on the well template.
  • the seabed foundation is realized in the form of a group of mud mats having skirts depending from their peripheries, or as a set of suction anchors/suction piles in dependence on the soil structure. Since full penetration into the seabed is critical to minimize the effects of horizontal loads on the well template, e.g., the aspect ratio (length/diameter) of suction anchors/piles can be in the order of 2:1 for stiff clay whereas very soft clay may require aspect ratios in the order of 7:1.
  • the template structure is a welded design comprising a base frame carrying parallel rows of well slots.
  • the well slots are arranged for accommodation of a well system with a valve tree respectively that can be installed in the well slot once the drilling equipment has been removed and the well bore has been completed.
  • the rows of well slots are separated by a central pipeline connection bay housing manifold header and valves of a manifold system connectable to the valve trees.
  • the template structure may have a four-sided shape when seen in a top view.
  • the template structure is seated on the seabed foundation and connected thereto through the movable connection that allows relative movement between the structure and the foundation, at least in the vertical direction as previously explained.
  • the template structure may be resting on suction anchors arranged in each end of the template structure.
  • the movable connection between the template structure and the seabed foundation can be realized in the form of a barrel or column that rises vertically from the upper end of each suction anchor to be slidingly received in a guiding tube that is formed on the structure base frame.
  • the vertical sliding mechanism can also be a part of a levelling jack system where a drive screw is implemented to actively level the template after installation
  • the column and guiding tube are preferably circular in section with mating diameters and a small annular play between, concentric surfaces.
  • the column and guiding tube may however alternatively be square in section.
  • the column may be hollow or solid.
  • connection between the template structure and the seabed foundation can be temporarily fixed or locked to provide a stiff engagement between the template structure and the seabed foundation, such as during template installation or drilling, e.g.
  • a locking bolt is arranged for insertion into the column via a hole formed in the wall of the guiding tube so as to arrest, in inserted position, the column relative to the guiding tube.
  • the nearby locking bolt can be removed by an ROV once the well system has been secured in the template structure.
  • the movable connection between the template structure and the seabed foundation is part of a levelling jack system.
  • the template structure 1 is a welded steel design comprising a base frame 2 which defines a number of well slots 3.
  • the well slots 3 are arranged in parallel rows on each side of a pipeline connection bay 4. Each row may contain 1, 2 or more well slots, e.g.
  • the well slots may be conventionally arranged and designed for accommodation of a well system as known to a person skilled in the art.
  • Structural members 5 of the base frame extend in opposite ends of the template structure to rest on the upper ends of suction anchors 6, the suction anchors together forming a seabed foundation generally denoted 7.
  • the suction anchors 6 are composed of a mud mat 8 having a skirt 9 depending from its periphery.
  • the suction anchors with skirts are dimensioned with respect to the soil conditions to be completely lowered into the soil until the mud mat 8 is about level with the mudline ML.
  • a column 10 respectively rises vertically from the mud mats 8 in the upper ends of the suction anchors 6.
  • the columns 10 are slidingly/telescopically received in guiding tubes 11 which are formed and secured in the base frame 2 of the template structure, and more particularly supported in the structural members 5 that extend from the base frame.
  • the columns 10 are formed with a length / that exceeds the height of the guiding tubes 11 by an amount which is at least equal to the maximum axial growth and elongation to be expected from the well completion and well components in thermal expansion, caused by the temperature in the fluid produced by the subsea wells.
  • FIGs. 1 and 3 illustrate the template structure in a lifted position which is a result of the lifting force (see arrows F) that is applied from the well(s).
  • the column 10 is formed with a hole (not shown) in its periphery for insertion of a locking bolt 12 via a hole 13 arranged through the wall of the guiding tube 11.
  • the locking bolt may be removed as illustrated by the broken line in Fig. 3 , such as by means of an ROV, or a pull line or hydraulic device, in order to release the connection between the template structure 1 and the subject suction anchor of the seabed foundation 7.
  • Installation and operation of the well template will typically include the following procedure:
  • the locking bolt is installed during template installation to secure the template structure to the seabed foundation.
  • the locking bolt is removed as the nearby well system is installed and secured in the template structure.
  • the template structure will be lifted up by the well as soon as it starts to produce, due to the heat from the produced flow.
  • the seabed foundation will however stay fixed in the mud due to the friction developed between skirts and mud, the columns and guiding tubes allowing the template structure with manifold to follow up with the well expansion and leave the seabed foundation as is, the foundation will continue to take any horizontal load through the vertical column and guiding tube.
  • the vertical release between the template structure 1 and the seabed foundation 7, the latter fixed to the seabed due to friction, will avoid any stress/deflection of the template structure during well expansion.
  • Fig. 4 shows in closer detail an embodiment of the connection between the template structure and the subsea foundation.
  • a column 10 circular in section, rises from the suction anchor 6 to be slidingly/telescopically received in a guiding tube 11, likewise circular in section, arranged on the structure.
  • the column 10 carries a plate 14 which rests loosely on the top of the column, the plate 14 having a central threaded through hole in which a drive screw 15 is received in threaded engagement.
  • the drive screw 15 depends from an end wall 16 arranged in the upper end of the guiding tube 11. Turning the drive screw in one direction results in lifting the template structure, whereas turning the drive screw in opposite direction results in lowering of the template structure.

Landscapes

  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Foundations (AREA)
  • Revetment (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Saccharide Compounds (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Claims (5)

  1. Gabarit de puits comprenant une structure de gabarit (1) reposant sur un fond marin (7), dans lequel la structure de gabarit et le fond marin sont reliés entre eux par l'intermédiaire d'un raccordement (10 ; 11) qui permet la mise en prise mobile entre la structure de gabarit (1) et le fond marin (7), au moins dans les directions verticales, dans lequel le raccordement mobile entre la structure de gabarit (1) et le fond marin (7) comprend une colonne (10) qui est agencé de manière à se soulever verticalement à partir d'une extrémité supérieure d'un ancrage par aspiration (6), la colonne (10) étant reçue de manière coulissante dans un tube de guidage (11), dans lequel le tube de guidage (11) est formé sur un élément structural (5) s'étendant à partir d'un châssis de base (2) inclus dans la structure de gabarit (1).
  2. Gabarit de puits selon la revendication 1, dans lequel le raccordement mobile (10 ; 11) entre la structure de gabarit (1) et le fond marin (7) peut être fixée temporairement au moyen d'un boulon de verrouillage (12) qui est insérable dans la colonne (10) par un trou dans la paroi du tube de guidage (11).
  3. Gabarit de puits selon la revendication 1 ou la revendication 2, dans lequel le fond marin (7) comprend un ensemble d'ancrages par aspiration (6) comprenant chacun une jupe (9) dépendant de la périphérie d'un tapis de boue (8).
  4. Gabarit de puits selon l'une quelconque des revendications précédentes, dans lequel la structure de gabarit (1) comprend des rangées parallèles de fentes de puits (3) séparées par une baie de connexion de pipeline (4).
  5. Gabarit de puits selon l'une quelconque des revendications précédentes, dans lequel le raccordement mobile (10 ; 11) entre la structure de gabarit (1) et le fond marin (7) fait partie d'un système de vérin de nivellement.
EP16195341.9A 2015-10-29 2016-10-24 Gabarit de puits sous-marin Active EP3163011B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO20151480A NO341175B1 (en) 2015-10-29 2015-10-29 Subsea well template

Publications (2)

Publication Number Publication Date
EP3163011A1 EP3163011A1 (fr) 2017-05-03
EP3163011B1 true EP3163011B1 (fr) 2019-09-18

Family

ID=57189948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16195341.9A Active EP3163011B1 (fr) 2015-10-29 2016-10-24 Gabarit de puits sous-marin

Country Status (3)

Country Link
EP (1) EP3163011B1 (fr)
DK (1) DK3163011T3 (fr)
NO (1) NO341175B1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201622129D0 (en) * 2016-12-23 2017-02-08 Statoil Petroleum As Subsea assembly modularisation
GB2569969B (en) * 2018-01-04 2020-04-08 Subsea 7 Norway As Integrating wells in towable subsea units
CN115492555B (zh) * 2021-06-18 2024-03-22 中国石油天然气集团有限公司 单筒多井吸力桩井口装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1341047A (en) * 1971-03-15 1973-12-19 Shell Int Research Means for guiding equipment to an offshore submerged well head
GB2091324B (en) * 1980-11-29 1984-08-08 Pearson Robert Colin Anchoring arrangement for a floating structure
US4445807A (en) * 1980-12-30 1984-05-01 Armco Inc. Diverless subsea template levelling system and method
US4589802A (en) * 1981-08-11 1986-05-20 Sedco, Inc. Slip assembly for subsea template
GB8511605D0 (en) * 1985-05-08 1985-06-12 British Petroleum Co Plc Vertical screw jack
NO320287B1 (no) * 2003-03-28 2005-11-21 Fmc Kongsberg Subsea As Bronnsystem og fremgangsmate for dannelse av et bronnsystem
NO333136B1 (no) * 2009-03-10 2013-03-11 Aker Subsea As Havbunnsbrønnramme med manifoldmottaksrom
NO334839B1 (no) * 2010-11-16 2014-06-16 Aker Subsea As Brønnhodesystem og låseanordning for utblåsningssikring

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
NO341175B1 (en) 2017-09-04
NO20151480A1 (en) 2017-05-01
EP3163011A1 (fr) 2017-05-03
DK3163011T3 (da) 2019-12-02

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